added TODO
the CGI plugin now:
 * properly parses the CGI response
 * passes HTTP_COOKIES, SCRIPT_FILENAME, SCRIPT_NAME to the CGI script
 * allows for an "index" file that gets invoked automatically when no other file
 * is specified
 * properly serves static files via internal redirects

TODO:
 * code is messy
 * in complex setups the scrips may be invoked with wrong parameters
 * the "index" file functionality is based on the assumption that urlParts[1]
 * always contains the directory where the app is located